From 36e5aceb3c1cc4d677c75a11caf248cb98a8c4fa Mon Sep 17 00:00:00 2001
From: Pavel Krymets <pavel@krymets.com>
Date: Wed, 22 Aug 2018 09:53:25 -0700
Subject: [PATCH] Serve 503 if server process is shutting down (#1293)

---
 .../OutOfProcessRequestHandler/forwardinghandler.cpp          | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/AspNetCoreModuleV2/OutOfProcessRequestHandler/forwardinghandler.cpp b/src/AspNetCoreModuleV2/OutOfProcessRequestHandler/forwardinghandler.cpp
index e06b15f805..881c6393ad 100644
--- a/src/AspNetCoreModuleV2/OutOfProcessRequestHandler/forwardinghandler.cpp
+++ b/src/AspNetCoreModuleV2/OutOfProcessRequestHandler/forwardinghandler.cpp
@@ -344,6 +344,10 @@ Failure:
     {
         pResponse->SetStatus(400, "Bad Request", 0, hr);
     }
+    else if (hr == E_APPLICATION_EXITING)
+    {
+        pResponse->SetStatus(503, "Service Unavailable", 0, S_OK, nullptr, TRUE);
+    }
     else if (fFailedToStartKestrel && !m_pApplication->QueryConfig()->QueryDisableStartUpErrorPage())
     {
         HTTP_DATA_CHUNK   DataChunk;